Draft-regulator



(No'Model.)

G. M. GITHBNS. DRAPTRBGULATOR.

Patented Jan. 9, 1883.

NTTED STATES PATENT Brice;

DRAFT-REGULATOR.

SPECIFICATION forming part of Letters Patent No. 270,302, dated January 9, 186.

V i Application filed May 22,1882. (No model.)

To all whom tt may concern:

'Be it known that I, GEORGE M. GITHENS, ot' Brooklyn, E. D., in the county of Kings and State ot New York, have invented an Improvenient in Damper-Regulators, ofwhich thcfollowing is a specitication. i

Figure l is `a vertical section. Fig. 2 is a vertical section ot' a mfloditication.

Damper-regulatorsfhave been made of two cylinders, one sliding within the other, and in which there is water that is exposed to the pressure of steam in a boiler by a pipe coilnecting such cylinder to the steam or water space ofthe boiler. The moving cylinder is connected with a damper in the flue, so that the pressure will move the damper and regulate the draft ofthe tire. In these regulators it is usual to set the parts so that with a given pressure the damper will close, and difculty has been experienced in constructing these regulators so that the damper will not close too-suddenly. Various devices have been made to effect this object; but there are more or less difticnlties in adapting the same to the various conditions of use. .A

I make use .of a tapering cylinder as the means for actuating my damper, such cylinder having an elastic packing that accommodates itself to the tapering surface, so that the area upon which the pressure acts is larger when the movement ofthe damper commences, and such area lessens as the movement progresses. Thereby the damper cannot be fully'moved until the pressure has increased sufficiently to equal on the smaller area the force exerted on the larger area in commencing the movement otsuch damper. The cylinder a is tapering and passes through the ilexible cup-1eather packing b within the cylinder c, and the. pressure acts to move the cylinder a cndwise within the cylinder b.

In the section Fig. l the parts are shown in suoli a position that the cylinder a, is supported at one end by the bracket c, and the cylinder c is forced upwardly and slides over the cylinder a. In the section Fig. 2 theparts are transposed in position, and the cylinder o is supported by the bracket or other convenient device, and the cylinder ct-is moved upwardly within such cylinder c. In either instance I make use et' a weight,f, and a rod, g, connecting the same to the moving part, suoli rod passing down through a packing .or gland in the stationary part, so that the weight serves to keep the parts-vertical and form a resistvalice to the pressure of the steam. Thisrod may be loaded with movable weights, so that' the saine steam-damper can lbe employed with different boilers carrying different pressures. Under all circumstances the weight is to b e sufcient to prevent the parts moving until the minimum presssure in the boiler is attained at .which itis desired to commence to close the damper, and the taper ofthe cylinder a is to be such that when the end movement has been givensufticient to close the damper I, by the wire and lever connections m, (illustrated in the drawings,) or by any other convenient means, the pressure must have accumulated to the maximum force, so as to exert on the smaller area ot' the tapering cylinder the necessary power 'to operate such damper. In the intermediate positions the* damper will close in the boiler.

I have found that with a movement ofahout twenty inches the cylinder tt may he about two inches in diameter at the larger end and about one inch and seven-eighths at thesmaller end. This will give the required differences in area and cause the damper to be moved gradually', and at the same time the cup-leather will easily accommodate itself tothe taper.

'The taper may be uniform from end to end, or

it may be more rapid in one portion than in another, orthe taper portion may he made of two or morev parallel portions united by tapering surfaces.

The connection for the pipe o to the boiler should be flexible, so as to allow of any slight movement that may he necessary to allow the parts to remain vertical7 and l preli'er and useV a semi-globular bearing, s, for the regulator y IOO effected if the piston is provided with an expansive cup-leather and the cylinder containing the same is tapering.

I claim as my invention- 1. The combination, in a. damper-regulator,

of the cylinders cq and c and connections to the damper, and elastic packing, the cylinder a being of a tapering form, for the purposes substantially' as set forth.

2. The combination, with the tapering cylinder a, of the cylinder c, packing b, Weightf, and rod g, and connection to the damper, substantially asset forth.

3. The combination, with the cylinders a c and packing, of the rod g, Weight f, and the globular segmental bearing for the regulator GEO. M. GITHENS.

Witnesses:

GEO. T. PINGKNEY, WILLIAM G. Mo'r'r. 

